Combined telephone and fire-alarm system.



W. W. DEAN. COMBINED TELEPHONE AND EIEE ALARM SY STEM. APPLICATION FILED AUG.15, 1903.

1,056,631 Patented Mar. 18,1913.

Wi fiwmm $3 1 mam/tow QMMA To c255 wfwm Q it known that WELLIAM W. DEAN 21 the United whites: 01'? A! v and 01s, have-13w 1 21 new mid Una Ii TflZiGPhUllS (1 EZ FFViCQ Sysinvention reintes more p rificuimiy ii? news in cciinbinzitioii @iepimne zmd alarm 01- kindred' synfuinnfs its features, as hereinsiome painmi out" are capable 01 s-zuzne'wh wider app] Cfl'iiJlL (P ne 01 me n ubiects 01' file nvention Tied bv the currents; "1 i301 "i316- respomive to the IIEPOSL but is .7 Clil'i'enf'i svnt 0W1" i110 telephone iines.

The: invention further comprises a ,syst-ei'n (if the class flex/ ihad in which. 2i varying auxiiizmy viii-rent over one side of the (elephmie iine is depended upvn for the operaiim) 01? the receiving device :ii "I i (rent-r211 ofiirtie; nisfi system in which said arying (rm-rams 2:17:- C "d from thzrcentrai common imteiy 0 the i'Qid' 'iihmlfi change, and also Hie vmnbinati-on with H tekpnone tine, of z: irzins'fm'nuey having Hfifi'mLUiui windingia interi'pnsi-d in the nppgisi '1 s: of the mafiiiiic line and a ifiiifi winding cunilecte' in an zmxiiieii'y (:ii :iliii whereby said transformer H1111. ponsi i9 i0 'taiephoiie uni-rem of am iypc out is responsive "to varying currents Sent m mniiiy one side of 320 line.

'9 features 4i: and fibjQiiS of tie inven- 1y app-1: from the deence ix :1 part of \iul hon v H inure i] dewr'ripfion and whims. imp; hm m {21w drawing fanning; this pv fik'fliiO'fl in which the $8189 referi nm chi 'fliiiiiS :11": used to designate iiko 9:111: 1 thmughoutand in Whichlifiig'nre l is a iiugimn of a system smboqlving my impmve ients, and Fig. 2 is 21 (11(1 gram of :1 system showing :i' difierent metl'i'od of appi i ing the same LLu substih i021 substaiwn 1 0011411 like comm siatla of the jack a c :ieiephcine lines. acti-iates sairi conductor 1s ciiscmmacced 50 the cimt'imii 2.1 ia imitigf his mm 1 j elm J and an a line 101' 2 is unrmziir da wted; to he Fswnneciefii im 59121.5; and, mummified with ishn tip hail of Hire lime Whmi the +711 m 2y R apex-aim 1M6 resistance 10 and wm'zeuaid with the 11% pole of battery B (1124: is co'mmcn t0 iiii. git card ciaircuits of the exchanrm and W Asia,

render the line signal ina'pemtive midi 'bhe conductor 3 is joined to the sieeve side of j the jack se ion of the telepiwne Kine oria outfit izmluiii as she usual The upei' cord. circuit which is pr ovicied an answering plug if anciaz calling i hav- 'Ellld 1- are connected. across tiw zinswewing' end (if the cord circuit unon on esite sides @f the battery and together cuntjmi the 10ml cm-ml 0i. Hie supervisory lamp S associamd relays 7" and r are iaca mi izilm cmlling The line w ,di.ict0i* is simiiariy connected by normal contavts of said cui-offf val-1y with dummy 9 .imhiding; 2i suitagg osses? end of the cord circuit upon opposite sides ,of a second common" battery B and together control "the local circuit of the supervisory signal S associated with the plug P The operators'head receiver 11, the secondary other induction coil 12 and a suitable 0on denser c are adapted to be bridged across the calling end of the cord circuit through the medium of any suitable listening key, her transmitter 13 and the primary of her induction coil 12 being charged from any suitable source of current. A ringing generator 14 of ordinary type is adapted to be connected with the forward portion of the tip strand t of the cord circuit by the corresponding spring of the ringing key 15, the sleeve strand 8 being simultaneously connected in a similar manner through the con ductor 16 including resistance 17 and the conductor 9 With the live pole of battery B Conversation is carried out in the ordi- 1 nary mann r in the telephone exchange thus typified. For example, a subscriber Wishing a connection takes up his receiver and thereby completes a path for current over the metallic circuit of his line from-the battery B and including the line relay R upon.

the other side of the circuit. This relay being operated closes the circuit of the line signal S which is preferably connected with the battery B in the ordinary manner. Upon observing this signal the operator inserts theanswering plug P of her cord circuit in one of the jacks of the line'and upon receiving the number of the party wanted, tests that line in" the usual manner to determine its idle or. busy condition; and, it found idle, the calling plug of the same cord circuit is connected with one of the spring jacks of that line and the ringing keys operated to call the subscriber. The insertion of either plug of the cord circuit energizes the corresponding sleeve supervisory relay or 1 together with the cut-ofi relay R of the line with which connection is estab lished, the cut-off relay serving as before pointed out to render the line signal inoperative and to place the line in condition for conversation. The actuation of the said supervisory relays closes the local circuits of the supervisory lamps, but -wh'ether said lampsare lighted or not depends upon the condition of thesubscribers telephone, since the supervisory relays r and 7*, which serve when actuated toopen said lamp circuits; are in the path of the current over the me "tallic telephone lines. During the connections therefore the supervisory lamps in form the operator at all times of the contlltion of the subscribc telephones.

The alarm receivin'g apparatus at the cen tral ofiice includes a transformer T ha'iing differential windings 18 and 19 placed in the line conductors 2 and 3 respectively and a tertiary winding 90 that is included in a normally closed current path including the Windin of the magnct Ql that controls the local circuit. of the alarm signal register. The windings 1.8 and 19 of said transformer are preferably superposed or otherwise in termittently associated so that the rapidly varying voice currents in the metallic telephone line neutralize each other and suti'cr no impedance. The battery current flowing in the metallic line likewise does not all'cct the transformer and the ringing currentalso is without effect upon the third winding 20.

The telephone currents, therefore. in flowing over the metallic circuit produce no ctl'ect.

upon the winding 20 and are not impeded by the presence of the transformer in the telephone line. The-:larm registering circuit is not shown in this figure, but in Fig. 2 I have shown the same in full. Said circuit includes an audible signal 22, the register magnet 28 and a suitable battery 24. these parts being preferably common to all of the lines of the exchange as indicated by the branching conductors at the points 25. .The signal is registered upon the tape :26 in "the ordinary manner. j ing or recording mechanism may obviously -be employed. In order to operate said Any other registeralarm signal receiving apparatus I place upon the line a call or alarm box of any dosired construction which includes a suitable make-and-break wheel 27, together with its brush 28 and in this instance I connect said brush by means of a conductor 29 with the -line conductor (see Fig. l) which at the cent :11 office is connected with the livc pole of the battpry B. The said makoand-brcak Wheel is connected with the magnetic intcrrupteriBO which may be of ordinary coir struction'i md which is prett-nfably adapted to rapidly interrupt the path for steady current that is completed by the make-andbrcak wheel from the line conductor 3 to ground. A condenser 31 may be placed upon the contacts of said intcrriq'itcr for the purpose of preventing sparking. It will thus be observed that when the make-andbrcalrwhcel is rotated, and its projections b01116 in contact with the brush 28, a path for current will be completed from ground at the central oflicc over the battery B. line conductor 3, includinp the winding 19 ot' the transformer T, COIlCllNtOf 29. brush 28. wheel 27. and thence through the magnet of the interrupter 30 and its normal contacts to ground. This circuihas is well umlcrstood will be rapidly made and broken by the magilet 30 and the impulses produced thereby through the winding .19 of the transformer will induce in its tertiary winding 20 a correspoodwig alterna ng current which will operate the magnet 21 and cause it to close a locel circuit of the alarm register. Magnet of cent e designed to suitably respond to such rapidly varying," current and to close the local clrcnrt or the register i accordance with the closing of the main circuit by the meke-and l reelr wheel 27.

l have not shown in this figure a DJGQllZF nism for controlling it make and break Wheel but it Will he understood that any ordinary method for controlling the slime they be employed. ln 2 for example l have shown. one method for controlling the make 'und-hreulr Wheel which includes the nmgnet 32 connected in a house circuit that includes n suit-able battery 3 3, closed circuit. thermostats 3e and a manually operated he 35. When said house circuit automatically or by the key 35, the urrnsi ture 36 of said magnet relea s the spring en mechanism of enddareak Wheel, which is accordingly actuated for :1 suitable length of time or number of rotutions to send in the alarm signal.

In place of the magnetic interrupter which is described I may use the rotary interrro y ter 37 shown connected vl'it-lrthe line cor.- doctor 8 a second point to rapidly make and hreult the circuit estu blishct through its brush 38, the meke-und-hreuk wheel 27 and a suitable conductor 39, and the line condoctor 3 from the battery B. The traineformer T is thus actuated to operate the alarm signal receiver.

In. Fig. 2 2i, telephone line shown which is of the some type as line L oi Fig. 1, except that the line re 3 E7 is located in the normal-connection. of said line conductor ot' the live pole of the battery the opposite line conductor 2 being grounded directly in the ordinary manner. The same arrangement of a difierentinlly wound trams-- former is provided at the cent-rel station to respond to the signaling, currents but at the substation I connect the brush 28 of the 111alre-end-hrenk Wheel with the line con-- (lnctor 2 by means of a suitable branch conductor 40, and the nmke-nnd-11ruh Wl'lecl itself connected by a conductor 41 with the secondary winding d2 of a suitable magnetic interrupter The prinmry winding 44 of said interrupter included in a local circuit containing the normal contacts 45 of said interrupter, u suitable battery it? and n rn'ially open contacts adapted to be closed hy-"arniuturo'iltl of said magnet 32. l l hen, therefore, the

magnet 32 1s denergized, said local circuit 1 completed and the mulreend-break wheel 27 is released. The 'prin'iury circuit of said magnetic interrupter is thus rapidly mode and broken, the secondary impulses are induced lfl tl'le winding 42 of the some and are opened, either ap iaratus including a common sou.

transmitted to the line over the wire 41.,

he made in the invention Without de .):n"ting -trom its scope or princigue. The ularni transmitter may be located at any point upon the line.

l'luving 'thus d scribed the principle of the invention and several ways of marrying: the some into cfi'cct. what 1 claim and do sire to secure by Letters Patent isi ln :1. teleplnine exchange. the (.Uhllllllillion with a telephone line, of n subscribers set at the substation of the line. telephonic apparatus associat d with the line at the central or'llce adapted to "Speratc with said line "and for com'crsutionzil purposes, means on the line for sending; a var-vine curren over one side of the li:' l t ornicr at t e central oliice having; differential wind ings in theopposite sides of the telephone line, a tertiary n'irn'ling tor mid transformer and registering apparatus connected with said tertiary Winding. the Arrangement of the windings being such that the transfornier ie unresponsive to telephone currents in the metallic line, but is rcspom've to said varying current over one side of inc line, and the registering apparatus is actuated thereby, substantially as described.

2. ln :1 telephone exchange, the combina tion with a telephone line, of a suhscribers at the eubstation of the line, telephonicnpparutus associated with the line at the central otllcc adopted to cooperate with said line and set for con m'smtional purposes, on alarm signal tmnsmitting device on the line to cause the flow of varying siginiling current over one side of the line. 2: transformer in the centre]. olliceheving a diilercnt-iul 'Winding pluced'in each side of the telephone In a telephone exchange, the combine;

tion with a. telephone line, of a subscriherh lie at the substation of theline, telephonic upperzitus associated with the line at the control oitlice adapted to cooperate with said line and set for conversational purposes. mud ol :urrentnormally connected with one side of the telephone line, an alarm signal transmiti ting device on the line adapted to complete the circuit of said source over said line conductor and to also rapidly interrupt the said circuit, and alarm signal receiving apparatus at the central otlice comprising a transformer having diilerential windings placed in opposite sides of the metallic line whereby it is unresponsive to currents in the metallic line circuit, and a tertiary winding, together with alarm registering apparatus connected to said tertiary winding, whereby when said transmitting device is actuated, the transformer will respond thereto and the signal will be received and stantially as described.

4. In a telephone exchange, the combination with a telephone line, of a subscribers set at the substation of the line, telephonic apparatus associated with the line at the I central office adapted to cooperate with said line and set for conversational purposes, an alarm signal transmitting device on the line adapted to send signaling currentsover one side thereof only, a transformer also at the central office having two differential windings in the metallic line circuit, and a. tertiary windingyand an alarm registering apparatus associated with said tertiary winding whereby when said signaling currents are sent over the line the transformer is responsive thereto and the apparatus is actuated, substantially as described.-

5. In a telephone exchange, the combination with a telephone line, of a subscribers set at the substation ot the line, an alarm signal transmitter upon the line and means associated with the transmitter to break up the signaling current into distinctive signals, a transformer at the central ot'ficc having diflierential windings in the opposite sides of the telephone line whereby a balanced or neutral condition is maintained for currents in the metallic line circuit, a tertiary winding for said transformer, alarm signal receiving apparatus fconnected with said tertiary winding for operation by currentinduced therein, and telephonic apparatus associated with said 41am signal receiving apparatus and adap;e'd to cooperate with said line and subscribders set for con versational purposes, said alarm signal transmitter adapted to unbalance the line when in operation, whereby when the alarin signaling currents are sent over the line the said transformer is actuated and the receiving device is operated, substantially as described. t

6. In a telephone exchange, the combination With a telephone line, of a subscribers set at the substation of the line, telephonic apparatus associated with the line at the recorded, suit having a. difierentia-l central ofiice adapted to cooperate with said line and set for conversational purposes, said apparatus including a common source of current normally connected with the telephone line, an alarm signal transmitting device on the line adapted to complete the circuit of said sourceover the line, means to rapidly interrupt said circuit, an alarm signal receiving apparatus at the central office including a relay inductively connected with the line whereby it is responsive to said signaling currents, said'relay being unresponsive to telephone signaling and talklIlQ' currents, substantially as described. 7

7 In a telephone exchange, the combination with a telephone line, of a subseribers set at the substation of theline, telephonic apparatus associated with the line at the central otiice adapted to cooperate with said lineand set for conversational purposes, said apparatus including a common source of current connected with the line at the central office, an alarm' signal transmitting device on the line adapted to complete the circuit of said source over theline, means to rapidly interrupt said circuit, alarm signal receiving apparatus at the central ofiice, said apparatus including a transformer connected with'thc line which is responsive to the alarm signaling currents but unresponsive to the telephonic signaling and talking currents, and a signal inductively connected with the line through said transformer, sub stantially as described.

8. In a telephone exchange, the combination with a metallic circuit telephone line, of a subscribers set at the substation of the line, means'on the line for sending a varying current over one side of the line only, a transformer also on the line having differential windings in the opposite sides thtreofavhereby it is unresponsive to currents in the metallic line but responsive to the varying current over one side. a tertiary winding for said transformer, telegraphic receiving apparatus connected thereto for operation therefrom which is irresponsive to telephone currents, and telephonic apparatus associated with said receiving apparatus and adapted to be directly connected with said substation line for conversational purposes,

but actuated by the varying currents, substantially as described.

9. In a telephone exchange,- the combination with a telephone line, of a subscrihers set at the substation of the line, telephonic apparatus associated with the line at the central ofiice adaptedto cooperate with said line and set for conversational purposes, an

alarm signal transmitting device on'the line I to cause the How of varying signaling current over one side of the line, av transformer W nding included in whereby when the alarm.

' I fit 0V8}? the line the and the facet- Uaiephunic apalzn'm sigma re awed to become i substation line the, con

subscrl a line, te'- nation with a is 6 mm nth versai'io a1 purposes,

1 common source (A with the tale-- Mann so on "the line,

' 0011- mimosa i-aio zmd a, signed. Zine t hm'ugh as; described. I 9 the combina ep onefllue, sf :1 t at we station on the i119, an itiing device upon 0121' (if the waimfmrinor sida llikl receiving apparatus connected to Wind- Yersational purposes, substantially as deings 0n the other side of said transformer j scribed.

for operation by currents induced in said f Signed by me at Chicago, county of Cock,

windings only said receiving apparatus State of Illinois, this 12th day of August, 5 adapted to be inductively affected by the 1903.

alarm signaling currents but unaffected by telephone currents, and telegraphic apparatus associated with said signal receiving apj Witnesses:

parat-us and adapted to coiiperate directly ROBERT LEWIS Aims, 10 with said substation line andset for con- Em A. GARLOCK.

WILLIAM W. DEAN. 

